I designed a simple pattern with Repper, turned it to 100% B&W in Photoshop and put it under our lasercutter. The result: your very own personally engraved banana, still very much edible
In case you find that the pattern appears suspiciously flat and think it’s a photoshop job, check the evidence: http://repperpatterns.com/2010/11/banana-mania-its-not-a-fake/